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Pastimes : Don't Ask Rambi

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To: Jack Clarke who wrote (6145)	1/13/1998 12:04:00 PM
From: Jacques Chitte	Read Replies (2) of 71178

Mornin', Jack. I ran into a similar chinscratcher over the adjective to ataxia, a problem that besets these aging axons. Following the Greek template, the adjective form oughtta be atactic. But my Webster's favors ataxic, and who am I to joust with the Big Red Book? (Now the AHD, that's a whole 'nother kettle of fish...) "Atactic" is a term from my old chemistry text. If you string together a long line of monomers with a single arm or extension from the monomer building block (in the pursuit of a linear polymer) the arms can line up in one of three ways or rhythms (my term, not the book's). If the arms line up right-right-right-right (all the same chiral sense) you have an isotactic polymer. It's possible to make them alternate right-left-right-left. This is the syndiotactic arrangement. Finally a random coin-toss polymer is specified, with right and left in no particular order. Voil… your atactic polymer. Isotactic polyolefins are wonderful structural materials; atactic ones make really good stickum for Post-Its. Dyslexic (my Japanese luxury car isn't running right)

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